Abrasive wheel with flexible resilient rim



Oct. 19, 1948. M. E. LANDAU ABRASIVE WHEEL WITH FLEXIBLE RESILIENT KIMFiled Oct.

, INVENTOR. MILEfE l/i/vawu BY KMMQZ Patented Oct. 19, 1948 UNITEDSTATES. PATENT OFFICE ABRASIVE WHEEL WITH FLEXIBLE RESILIENT RIM MilesE. Landau; Brooklyn, N. Y.

Application October 15, 1947, Serial No. 780,025

6 Claims. 1

This invention relates to abrasive wheels and has particular referenceto an abrasive wheel having an abrasive rim so constructed and arrangedas to permit it to adjust its surface at the place of contact to thecontour of the surface of the material being finished, the same being acontinuation in part of co-pending application Serial No. 722,454, filedJanuary 16, 1947.

The invention has for an object the provision of an abrasive wheelhaving a resilient tread forming the rim thereof which is flexiblymounted to permit it to expand when centrifugal effect forces it outwardto an extended position from which position any part of it may bedepressed or flattened, thus adjusting its abrasive surface to thecontour of the work at the place of contact to produce a flat grindingor finishing action.

Another object of the invention is the provision of a tread consistingof an abrasive rim in the form of a resilient and flexible annulustogether with tension means for adjustably securing an abrasive belt onthe periphery thereof.

The invention has for a further object the provision of a separableflexible abrasive belt adjustably secured upon the periphery of thetread permitting the said belt to expand and contract as changes occurin the tread during operation.

A further object of the invention is to provide a peripheral grooveformed into the tread and serving to seat a corresponding rib formed ina separable abrasive belt throughout its entire 7 length, the said ribbeing held :firmly in the groove of the tread during rotation whencentrifugal force expands the tread with resultant pressure of the treadagainst the inner surface of the flexible abrasive belt.

A further object of the invention is to dispense with the separableabrasive belt for certain kinds of work and instead to incorporate intothe tread composition suitable abrasive or polishing powder materialwhereupon the tread itself becomes the abrasive means and requiringreplacement when worn out.

With the foregoing and other objects in view reference is now madeto thefollowing specification and accompanying drawings in which the preferredembodiments of the invention are illustrated.

In the drawings:

Fig. l is a side view of an abrasive wheel constructed in accordancewith the invention and illustrating the same with parts broken away toshow the underlying construction.

Fig. 2 is a transverse fragmentary sectional view taken approximately online 2-2 of Fig. 1, showing the wheel casing.

Fig. 3 is a similar view showing the wheel casing and the operatingparts in position therein.

Fig. 4 is a sectional view through a rim and belt with interengageablegroove and rib.

2 Referring to the drawings by-characters of reference, the abrasivewheel includes a casing consisting of oppositely disposed circular sideplates 10 and ll secured to the opposite ends of a hub l2 having anopening therein to receive a driveshaft, the side plates 10 and l Ibeing spaced apart to provide a circumferentially extending spacetherebetween. The side plates l0 and II have arcuately spaced extensionsor projections i3 10- cated adjacent the rims thereof so as to formtransversely extending trunnions.

. Located between the rims of the side plates is a peripheral tread l4of annular formation having parallel side faces l5 and Iii andarcua'tely spaced apertures ll extending through the opposite side wallsthereof through which the trunnions l3 loosely extend for flexiblymounting the tread thereon with the outer periphery of the treadprotruding beyond the peripheries ofthe side plates. The tread isfashioned of flexible resilient material and fits loosely between theside plates while the transverse apertures I! are of larger diameterthan the trunnions [3 to thereby permit of the free movement of thetread on the trunnions. n

An annular spring metal band member l8 is located between the sideplates in engagement with the inner periphery of the tread to serve as aresilient support therefor. A flexible abrasive belt I9 surrounds thetread and is tensioned thereon by wire yoke members 29 pivotallyanchored at their inner ends to inwardly bowed leaf springs 2| securedat their outer ends'22 to the inner face of a rigid'annular metal band23. The yoke members 20 each include opposite side leads 24 and terminalfingers 25 extending transversely from the outer ends of the side'leadsand engaging in notches 28 formed in theiperiphery of thetread with theabrasive belt l9 extending into said notches and underlying the terminalfingers therein. The yoke and leaf spring members are quadrantly spacedapart with the yoke members extending through openings 21 in the annularband member 23 and the terminal fingers 25 engaging the abrasive belt l9at quadrantly spaced locations. The yoke and leaf spring members arefreely movable between the side' plates l0 and H and provide a floatingtension means for adjustably securing the abrasive belt 19 on theperiphery of the tread so that the same is free to change with thechange in circular formation of the tread. By this-constructiontheannular tread i4 is adapted to expand or elongate from circularformation during rotation thereof which permits it to depress or flattenand adjust the periphery at any part thereof with thesurface of thematerial pressed thereagalnst in the abrading operation.

Instead of the yoke and leaf spring members, the tread may be formedwith a shallow centrally arranged recess or depression 28 extendingcontinuously about the outer periphery thereof as indicated in Fig. 4 ofthe drawings. An abrasive belt 29 formed with an inwardly projecting rib30 extending continuously about the inner periphery thereof is adaptedto engage in the recess or depression 28 in the tread for retaining thebelt on the tread and preventing sidewise movement thereof.

The tread is preferably fashioned of elastic rubber composition materialand the same may be impregnated with an abrasive substance so that theouter periphery of the tread becomes the abrasive surface of the wheel.

What is claimed is:

1. In an abrasive wheel, a circular casing including a hub and oppositeside plates disposed in spaced relation and projecting outwardly beyondthe hub to provide a circumferentially extending space therebetween, aflexible tread located between said plates with the outer portionthereof protruding beyond the peripheries of the side plates, trunnionscarried by said side plates and extending through apertures in saidtread for loosely supporting the tread between the side plates andpermitting radial movement thereof, an annular spring band freelyarranged between said side plates on which the inner P p ery of thetread is disposed; an abrasive belt arranged on the outer periphery ofsaid tread, and tensioned means located between the side plates andconsisting of yoke members en gaging said belt at circumferentiallyspaced lo cations about the wheel and pivotally secured "-i:

to spring members located between the side plates and between the huband said band member for securing and resiliently tensioning the belt onthe tread.

2. In an abrasive wheel, a hub having side plates disposed in spacedrelation to provide a circumferentially extending space therebetween, aflexible resilient tread. of annular formation mounted between the sideplates with the outer peripheral portion thereof protruding beyond themitting radial movement of the tread, an annular spring band freelyarranged between said side plates in surrounding relation with the hubon which the inner periphery of the tread is resiliently supported, saidtread having circumferentially spaced notches in the outer peripherythereof, an abrasive belt arranged on the outer periphery of said treadand engaging in said notches, yoke members having transversely extendingfingers overlying the belt in said notches, a rigid annular band freelyarranged between said side plates and bowed spring members secured attheir inner ends to the inner face of said last mentioned band and.pivotally connected medially thereof to said yoke members for securingand resiliently tensioning the belt on the the peripheries of saidplates, said side plates having arcuately spaced trunnions extendingthrough apertures in the tread for loosely supporting the tread thereonbetween the said plates and permitting radial movement of the tread, andan annular spring band freely arranged between said side plates insurrounding relation with the hub on which the inner periphery of thetread is resiliently supported.

4. In an abrasive wheel, a hub having side plates disposed in spacedrelation to provide a circumferentially extending space therebetween, aflexible resilient tread of annular formation mounted between the sideplates with the outer peripheral portion thereof protruding beyond theperipheries of said plates, said side plates having arcuately spacedtrunnions extending through apertures in the tread for looselysupporting the tread thereon between the said plates and permittingradial movement of the tread, an annular spring band freely arrangedbetween said side plates in surrounding relation with the hub on whichthe inner periphery of the tread is resiliently supported, said treadhaving circumferentially spaced notches in the outer periphery thereof,an abrasive belt arranged on theouter periphery of said tread andengaging in said notches, and tensioned yoke members having transverselyextending fingers overlying said belt in said notches for securing andresiliently tensioning the belt on the tread.

5. In an abrasive wheel, a hub having side plates disposed in spacedrelation to provide a circumferentially extending space therebetween, aflexible resilient tread of annular formation mounted between the sideplates with the outer peripheral portion thereof protruding beyond theperipheries of said plates, said side plates having arcuately spacedtrunnions extending through apertures in the tread for looselysupporting the tread thereon between the said plates and permittingradial movement of the tread, an annular spring band freely arrangedbetween said side plates in surrounding relation with the hub on whichthe inner periphery of the tread is resiliently supported, an abrasivebelt arranged on the outer periphery of said tread and means securingthe same thereon against lateral movement.

6. In an abrasive wheel, a hub having side plates disposed in spacedrelation to provide circumferentiallyextending spaces therebetween, aflexible resilient tread of annular formation mounted between the sideplates with the outer peripheral portion thereof protruding beyond theperipheries of said plates, said side plates having arcuately spacedtrunnions extending through apertures in the tread for looselysupporting the tread thereon between the said plates and permittingradial movement of the tread, an annular spring band freely arrangedbetween said side plates in surrounding relation with the hub on whichthe inner periphery of the tread is resiliently supported, an abrasivebelt engaging about the outer periphery of said tread, and said treadand belt being formed with interengageable peripheral groove and beadfor preventing movement of the belt with reference to the tread.

MILES E. LANDAU.

No references cited.

